burnerman
Member
Has anyone seen a good working example of a program to control a motorised valve from a plc's PID block?
That is to say use the numerical output of the PID block to drive a pair of discrete outputs - "valve move towards open" and "valve move towards close" - based on the full stroke travel time of the motor rather than relying on a slidewire position feedback signal.
Preferably for a GE Fanuc 90-30 but not really important - it's the routine not the code that we're interested in.
We've programmed our own before but they never seem to work as well as the proprietry panel mounted controllers, e.g. West, Eurotherm, Honeywell etc.
That is to say use the numerical output of the PID block to drive a pair of discrete outputs - "valve move towards open" and "valve move towards close" - based on the full stroke travel time of the motor rather than relying on a slidewire position feedback signal.
Preferably for a GE Fanuc 90-30 but not really important - it's the routine not the code that we're interested in.
We've programmed our own before but they never seem to work as well as the proprietry panel mounted controllers, e.g. West, Eurotherm, Honeywell etc.